Ah crap - I forgot I started to flesh out this world and found this:
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The gateway town of Skyhaven will most likely be adventurers’ first contact with the cloudlands. It is populated by humans, gnomes and kenku, with a smattering of other races. It is ruled by a cloud giant. Skyhaven established a Gate with a town on the ground as its inhabitants were fed up with a mushroom and bird diet, craving for fish, meat and the fruits of terrestrial plants. A Gate was explicitly not set up with any settlements in [nearby wizardly kingdom] for fear the wizards would somehow invade and take over the place. There is a thriving trade through the Gate - the cloudlanders getting fruit and berries from trees (they get a bit sick of mushrooms and green leafy things that can be grown up high) as well as meat.
Monsters
Aarakocra (MM p12)
White dragon (MM p100)
Peryton (MM p251) - prey on humanoids
Roc (MM p260)
Giant eagle
Pegasus (MM p250) - live on grasslands
Ice mephit (MM p215)
Aerial assault gnome (ToH p9)
Cloud dragon (ToH p108)
Fogwarden (ToH p151)
Lightning mephit (ToH p229)
Fulminar (CC p165)
Azza gremlin (ToB p28)
Bereginyas (ToB p36)